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Choi, Nam-Soon
Energy Materials Lab
Research Interests
  • Rechargeable lithium battery, electrolytes for next generation Mg and Na battery

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Cost-effective scalable synthesis of mesoporous germanium particles via a redox-transmetalation reaction for high-performance energy storage devices

Cited 4 times inthomson ciCited 3 times inthomson ci
Title
Cost-effective scalable synthesis of mesoporous germanium particles via a redox-transmetalation reaction for high-performance energy storage devices
Author
Choi, SinhoKim, JieunChoi, Nam-SoonKim, Min GyuPark, Soojin
Issue Date
2015-02
Publisher
AMER CHEMICAL SOC
Citation
ACS NANO, v.9, no.2, pp.2203 - 2212
Abstract
Nanostructured germanium is a promising material for high-performance energy storage devices. However, synthesizing it in a cost-effective and simple manner on a large scale remains a significant challenge. Herein, we report a redox-transmetalation reaction-based route for the large-scale synthesis of mesoporous germanium particles from germanium oxide at temperatures of 420-600 °C. We could confirm that a unique redox-transmetalation reaction occurs between Zn0 and Ge4+ at approximately 420 °C using temperature-dependent in situ X-ray absorption fine structure analysis. This reaction has several advantages, which include (i) the successful synthesis of germanium particles at a low temperature (∼450 °C), (ii) the accommodation of large volume changes, owing to the mesoporous structure of the germanium particles, and (iii) the ability to synthesize the particles in a cost-effective and scalable manner, as inexpensive metal oxides are used as the starting materials. The optimized mesoporous germanium anode exhibits a reversible capacity of ∼1400 mA h g-1 after 300 cycles at a rate of 0.5 C (corresponding to the capacity retention of 99.5%), as well as stable cycling in a full cell containing a LiCoO2cathode with a high energy density (charge capacity = 286.62 mA h cm-3)
URI
https://scholarworks.unist.ac.kr/handle/201301/10987
URL
http://pubs.acs.org/doi/abs/10.1021/acsnano.5b00389
DOI
10.1021/acsnano.5b00389
ISSN
1936-0851
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